Method parse_optional_as_of

src/sql-parser/src/parser.rs:8682–8705

Parse `AS OF`, if present.

(&mut self)

    /// Parse `AS OF`, if present.
    fn parse_optional_as_of(&mut self) -> Result<Option<AsOf<Raw>>, ParserError> {
        if self.parse_keyword(AS) {
            self.expect_keyword(OF)?;
            if self.parse_keywords(&[AT, LEAST]) {
                match self.parse_expr() {
                    Ok(expr) => Ok(Some(AsOf::AtLeast(expr))),
                    Err(e) => self.expected(
                        e.pos,
                        "a timestamp value after 'AS OF AT LEAST'",
                        self.peek_token(),
                    ),
                }
            } else {
                match self.parse_expr() {
                    Ok(expr) => Ok(Some(AsOf::At(expr))),
                    Err(e) => {
                        self.expected(e.pos, "a timestamp value after 'AS OF'", self.peek_token())
                    }
                }
            }
        } else {
            Ok(None)
        }
    }

    /// Parse `UP TO`, if present
    fn parse_optional_up_to(&mut self) -> Result<Option<Expr<Raw>>, ParserError> {